1. Solving Systems Using Matrices

2. Setting Up a Matrix
When we solve systems using matrices, we must align the x and y variables.
Then we take the coefficients of each variable
Example:
5x + 3y = 6
2x – 8y = 2

3. What is a Matrix? A set of numbers arranged in rows and columns
Example:
We name a matrix based on the number of rows X the number of columns

4. To Actually Solve Using Matrices
To solve a matrix for x and y, we put it in the calculator.
Steps:
1. Hit ALPHA, ZOOM
2. Enter number of rows/columns
3. Hit OK
4. Type values into matrix
5. To solve, raise the entire matrix to -1 (x-1 key under MATH key) then multiply by answer matrix

5. Example What is the x coordinate of the following system of equations?
4x +3y = 3
2x + y =-3